I'm signing up an affiliate and they requested some JavaScript to go into certain pages. Can you let me know how and where to insert such code?

PRESSERO > *Pressero FAQs
Scripts are not allowed in the editors for page content, product content, or category content; CSS and HTML are allowed, but scripts will be stripped out by the system. There are two places that do allow scripts, though: the share script area and the HTML head area; both of those are edited in Admin > Site > Site Name > Settings > "SEO / HTML" tab.